Zoology Fundamentals and Vorticella Life Cycle
Key Biological Terms and Definitions
- Taxonomy: The branch of biology concerned with the identification, naming, and classification of living organisms based on shared characteristics.
- Amphiblastula Larva: The amphiblastula is a free-swimming, oval-shaped larval stage found in certain sponges (Phylum Porifera, such as Scypha). It features flagellated cells on the anterior half and non-flagellated cells on the posterior half.
- Taeniasis: An intestinal parasitic infection caused by adult tapeworms belonging
Brain and Spinal Cord Anatomy: Chapter 12 Study Notes
1. Major Regions of the Adult Brain
- Cerebrum: Conscious thought, memory, sensation, voluntary movement
- Diencephalon: Thalamus, hypothalamus, epithalamus
- Brainstem:
- Midbrain
- Pons
- Medulla oblongata
- Cerebellum: Balance, posture, coordination
Memory Trick: CDBC (Cerebrum → Diencephalon → Brainstem → Cerebellum)
2. Ventricles
There are 4 ventricles:
- Right lateral ventricle
- Left lateral ventricle
- Third ventricle
- Fourth ventricle
CSF Pathway
Lateral ventricles → Interventricular foramina → Third ventricle →
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The Human Eye
The eye is the sense organ responsible for vision. It detects light and converts it into nerve impulses that are interpreted by the brain.
Structure and Functions
- Cornea: Transparent front part; refracts (bends) light.
- Sclera: Tough white outer layer; protects the eye.
- Choroid: Middle pigmented layer; nourishes the eye and prevents internal reflection.
- Iris: Colored part; controls the size of the pupil.
- Lens: Transparent, biconvex; focuses light on the retina (accommodation).
- Optic nerve:
Diffusion and Osmosis: Principles of Passive Transport
Understanding Diffusion
Diffusion is the net movement of particles from an area of high concentration to an area of low concentration.
Key Characteristics of Diffusion
- It happens in liquids and gases.
- Particles move randomly all the time.
- It is a passive process.
- It does not need energy from the cell.
Diffusion in Biological Cells
Cell membranes are partially permeable. This means:
- Small molecules can pass.
- Large molecules cannot pass easily.
Diffusion happens across the membrane when there is a concentration
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Ecosystem Definition and Functional Units
Definition: An ecosystem is a community of living organisms (plants, animals, and microorganisms) that interact with each other and with non-living components (air, water, soil, sunlight, and minerals) in a particular area. It is a basic functional unit of nature where energy flows and nutrients are recycled.
Core Components of an Ecosystem
1. Biotic Components (Living Components)
These are the living parts of an ecosystem:
- Producers: Green plants that make their
Mass and balance
BIO DIVERSITY Variation = differences btwn organisms; physical (size, colour, shape) or behavioural.~Interspecific = btwn species. Intraspecific = within same species.~Species = organisms that can interbreed + produce fertile offspring.~Biodiversity = variety of life; ↑ variation = ↑ biodiversity.~Adaptation = variation that improves survival/reproduction.• Structural = physical trait• Behavioural = action/behaviour~Natural Selection: helpful variation → survive/reproduce → trait passed
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